I think you're missing the point of a LINEAR regulation power supply.
SO much more than the cheaper power supplys I have had in the past and the current limit has save some of my components form untimely deaths.
So I'm curious how good it actually is (I would expect it to be rather slow in response). And what about stability with capacitive load...
SO much more than the cheaper power supplys I have had in the past and the current limit has save some of my components form untimely deaths.
Actually, has anyone measured its load response? ...
If you let me know a little in detail what exactly you are interested in, I may post some measurement results with
this PSU DP832 using electronic load (Maynuo M9811)
If you let me know a little in detail what exactly you are interested in, I may post some measurement results with
this PSU DP832 using electronic load (Maynuo M9811)
Hi Peter,
I'm no specialist in benchmarking PSUs, but I think it would be great to see:
....
here are the first results. Measurements taken with 1/10 probe, so all Y-values have to be divided by 10.
here are the first results. Measurements taken with 1/10 probe, so all Y-values have to be divided by 10.
Thank you very much! Just one question, should the values be divided by 10, or multiplied by 10? If divided then it's a very-very good result. If multiplied that would be... uhm, not great at all . So, 1/10 probe means attenuation by the factor of ten, or 10x amplification?
PS I wrote you a personal message about the stuff I promised.
I am also planning to compare to my Keithley PSU.
here are the first results. Measurements taken with 1/10 probe, so all Y-values have to be divided by 10.
......... I am also planning to compare to my Keithley PSU.
Here we go: Keithley 2304A, Setting 19V/3A, Load 100mA to 2A and vice versa.
Consider the Y scale! Does not look bad for the Rigol at all
I am also planning to compare to my Keithley PSU.
Ho-ho-ho, Keithley should "destroy" that rigol hands down . Actually, the results you obtained is already enough to conclude DP832 is a "snail" PSU.
Here is, just for comparision, step response of TI's lm1085.pdf 0-3A with 100mA preload: (see first attachment).
And, one of the fastest MOSFET drivers on the market, lt1575, step response 0.2-5A: (see another attachment). It was designed for Pentium 2 CPUs, that's why it is fast like hell. I can't imagine what modern CPU power supplies can do... They should respond to change of tens of A in some hundreds of nanosecond. But they all are very low-voltage, while lt1575 works up to 18V or so.
PS all pictures from datasheets, so they should be taken with some grain of salt.
The load response especially of a universal/Lab PSU depends by far more on the design of the voltage control loop than on particular chips or transistor.
The design has to take care on regulator loop stability and static load regulation as well (the latter value is well suited for outnumbering in data sheets).
I am also planning to compare to my Keithley PSU.
.....
PS: Just took a quick and dirty (I know, I know) test mesuring the capacitance between outputs: Rigol 500..800µF, Keithley 130..150µF (... depending on polarity of meter)Epilogue: Your question wheter a LED would survive (set 12V and 3mA current limit and connect LED): I belive not:
To finally measure the output capacitor I had a very old fashioned idea: C=I*t/U.
I did set the current regulation (which is quite precise) to 5mA, voltage to 30V, did short the output and measured the time until 30V are reached after the short (3.4 sec)
C=(5e-3A * 3.4s)/30V = 566.66 µF (my fluke was almost right . ( I know, that a look into a schematic would be easer, but it was more fun this way)
I.e. it is unlikely that a LED survives a discharge of such a capacitor. If you want to light a led, I'd recommend to use lower voltage setting.
It does not speak for the DP832 that such a big ouput capacitor is needed to hold the data sheet values.
Fast regulators like the LT1575 also need a suitable layout to get fast.